[PATCH] i386/x86-64: Return defined error value for bad PCI config space accesses

Mostly to get better handling when a extended config space
access has to fallback to Type1.

Cc: gregkh@suse.de
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/i386/pci/direct.c

@@ -19,8 +19,10 @@ int pci_conf1_read(unsigned int seg, unsigned int bus,
 {
 	unsigned long flags;
 
-	if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
+	if (!value || (bus > 255) || (devfn > 255) || (reg > 255)) {
+		*value = -1;
 		return -EINVAL;
+	}
 
 	spin_lock_irqsave(&pci_config_lock, flags);
 

arch/i386/pci/mmconfig.c

@@ -80,8 +80,10 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 	unsigned long flags;
 	u32 base;
 
-	if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
+	if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) {
+		*value = -1;
 		return -EINVAL;
+	}
 
 	base = get_base_addr(seg, bus, devfn);
 	if (!base)

arch/x86_64/pci/mmconfig.c

@@ -75,8 +75,10 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 	char __iomem *addr;
 
 	/* Why do we have this when nobody checks it. How about a BUG()!? -AK */
-	if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095)))
+	if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095))) {
+		*value = -1;
 		return -EINVAL;
+	}
 
 	addr = pci_dev_base(seg, bus, devfn);
 	if (!addr)